With diets like this they are not ever good ideas, because as soon as it stops you can easily put back on the weight.
I had gotten up to 250 lbs when my oldest was hospitalized. I am one who gains weight under stressful situations. I lost all my weight by sheer diet and exercise. With saying that, because I know you don't want to hear this and you say you have "tried that and you don't lose a thing." My questions are-how long have you tried it and what were you doing.
I was keeping a strict food journal. I was a little excessive on the working out, but I wanted fast results. I worked out 2-3 hours a day. I know most don't have time for this, but it required getting up early and working out before my kids got up and then doing it again after they went to bed.
If you want it bad enough and you are willing to change your lifestyle-it will work. Look at all those people on the biggest loser who say they couldn't do it at home. I would honestly be interested in what you have done in the past to lose weight and how long you did stick with it. Because trust me-magic pills may work, but they only work for so long!!